Sustaject-250 is a mix of 4 testosterone esters: testosterone propionate 30 mg/ml, testosterone phenylpropionate 60 mg/ml, testosterone isocaproate 60 mg/ml and testosterone decanoate 100 mg/ml. Total 250 mg/ml. All 4 components have a synergic effect and have time-released effect for up to 2 weeks. It leads to substantial growth in strength and body mass without the need of frequent enjections.